fix(fs): add missing defered Cleanup() call to post analyzer fs

[jinroh]

Description

Trivy appears to be leaking /tmp/analyzer-fs-* directories when using FS artifacts.

This PR adds the call to Cleanup() that is already done in VM and Image artifacts.

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[CLAassistant]

All committers have signed the CLA.

[DmitriyLewen]

@jinroh thanks!

LGTM. cc. @knqyf263

[DmitriyLewen]

@jinroh can you sign CLA?

[jinroh]

@jinroh can you sign CLA?

done.

[knqyf263]

Filesystem scanning is not supposed to create any files in the directory, so I thought we didn't need to clean it up, but as you pointed out, the empty directory created when initializing will remain.

trivy/pkg/fanal/analyzer/fs.go

Line 23 in 5f78ea4

tmpDir, err := os.MkdirTemp("", "analyzer-fs-*")

Thanks for your contribution.